Correct, sempai. I have not yet learned any suiton, but I have trained in other elements.
Ok, suiton is the nature transformation of chakra into water, one of the five basic elements of chakra, allowing the user to manipulate water or create their own.
Against the other elements, suiton is strong against fire, or katon, because the water will cool the flames and extinguish them, while weak against earth, or doton, because structures made from earth can absorb the water's impact, even absorbing water itself.
Some KGs that I know of that uses water as a component are the boil, storm, and wood releases, which also requires the use of katon, raiton, and doton respectively.
Also, three users of suiton that I can think of off the top of my head? Umm... well.... how about Suigetsu, Kisame, and Tobirama?
Is this ok, sempai?